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Propagating slow sausage waves in a sunspot observed by the New Vacuum Solar Telescope
Feng Song1; Deng Zheng1; Yuan Ding2; Xu Zhi3; Yang Xiao4
2020
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume20Issue:8
AbstractA sunspot is an ideal waveguide for a variety of magnetohydrodynamic waves, which carry a significant amount of energy to the upper atmosphere and could be used as a tool to probe the magnetic and thermal structure of a sunspot. In this study, we used the New Vacuum Solar Telescope and took highresolution image sequences simultaneously in both TiO (7058±10 °A) and Hα (6562±2.5 °A) bandpasses. We extracted the area and total emission intensity variations of sunspot umbra and analyzed the signals with synchrosqueezing transform. We found that the area and emission intensity varied with both three and five minute periodicity. Moreover, the area and intensity oscillated in phase with each other, this fact hold in both TiO and Hα data.We interpret this oscillatory signal as a propagating slow sausage wave. The propagation speed is estimated at about 8 km s~(-1).We infer that this sunspot's umbra could have temperature as low as 2800–3500K.
KeywordSun: sunspot Sun: oscillations magnetohydrodynamics (MHD) methods: data analysis
Language英语
WOS IDWOS:000570980900001
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/73770
Collection中国科学院国家天文台
Affiliation1.昆明理工大学
2.哈尔滨工业大学
3.中国科学院云南天文台
4.中国科学院国家天文台
Recommended Citation
GB/T 7714
Feng Song,Deng Zheng,Yuan Ding,et al. Propagating slow sausage waves in a sunspot observed by the New Vacuum Solar Telescope[J]. Research in Astronomy and Astrophysics,2020,20(8).
APA Feng Song,Deng Zheng,Yuan Ding,Xu Zhi,&Yang Xiao.(2020).Propagating slow sausage waves in a sunspot observed by the New Vacuum Solar Telescope.Research in Astronomy and Astrophysics,20(8).
MLA Feng Song,et al."Propagating slow sausage waves in a sunspot observed by the New Vacuum Solar Telescope".Research in Astronomy and Astrophysics 20.8(2020).
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